Computer Powered Off Suddenly (Without BSOD)

Results of HD Tune + Updated Zip (ASUS Drivers have been updated, no recent BSODs):

Attachment 167841Attachment 167842Attachment 167843Attachment 167844

Please update the progress with post #2 steps 7 - 10.

Choose one of the temperature monitoring software applications: Speecy, HW monitor, Speed fan:
Speccy - Free Download - Piriform: Speccy - System Information - Free Download
HWMONITOR | Softwares | CPUID: HWMONITOR | Softwares | CPUID
SpeedFan - Access temperature sensor in your computer: SpeedFan - Access temperature sensor in your computer

Pending the results of the Memtest86+ version 5.01 testing the plan is to stress test CPU and GPU.

The last BSOD was on 10/13/2017.
Crashes that occurred after that time were not BSOD.
10/26; 11/22; 12/11
That was a spontaneous crash every 20 to 26 days.

Memory test results, steps 8-10 done:

Attachment 167906

1) Run Prime95 - Stress Test Your CPU
Prime95 - Stress Test Your CPU Windows 10 Performance Maintenance Tutorials
Prime95 - Stress Test Your CPU Performance Maintenance Tutorials
2) Record maximum temperatures and duration of testing.
3) Aim for > 3 hours testing
4) Abort testing as needed per the warnings in the above link
5) Please use the Microsoft snipping tool to post images into the thread.
Take Screenshot in Windows 10 Windows 10 General Tips Tutorials
Take Screenshot in Windows 10 General Tips Tutorials

6) Run FurMark - GPU Stress Test Windows 10 Performance Maintenance Tutorials
7) Aim for > 1 hour testing
8) Please make note of the importance of temperature monitoring and aborting the test in the GPU link.
FurMark - GPU Stress Test Windows 10 Performance Maintenance Tutorials:
FurMark - GPU Stress Test Performance Maintenance Tutorials